Not Rendering on Android emulator
I followed your examples but the result is html code tpl.html is exist in /android/app/src/main/assets

I have the same problem. IOS is right.
react-native 0.59.1
As facebook mentioned here Warning Please use the react-native-community/react-native-webview fork of this component instead. To reduce the surface area of React Native, <WebView/> is going to be removed from the React Native core. For more information, please read The Slimmening proposal. I believe it's the cause of the problem . library should be updated to use webview from https://github.com/react-native-community/react-native-webview instead
It was the solution for another echart wrapper here